Nuclear Magnetic Resonance Under Extreme Conditions: High-Pressure NMR Probe Development, and NMR Applications to the Dynamics of Confined Liquids
Ballard, Lance Edward Lynn
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https://hdl.handle.net/2142/84362
Description
Title
Nuclear Magnetic Resonance Under Extreme Conditions: High-Pressure NMR Probe Development, and NMR Applications to the Dynamics of Confined Liquids
Author(s)
Ballard, Lance Edward Lynn
Issue Date
1997
Doctoral Committee Chair(s)
Jonas, Jiri
Department of Study
Chemistry
Discipline
Chemistry
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Chemistry, Analytical
Language
eng
Abstract
Dynamic NMR studies at ambient pressure were also perfonned on the polar fluids ethanol, 2,2,2-trifluoroethanol, propionic acid, and pentafluoropropionic acid confined to porous silica glasses with well-defined pore sizes. The $\sp{13}$C NMR spin-lattice relaxation times were measured and analyzed in terms of the two-state-fast exchange model, which allows separation of the surface layer relaxation rates. The experiments showed that the hydrocarbon fluids form stronger hydrogen-bond interactions with the silica surface, and that confinement has little effect on the internal rotation of terminal -CF$\sb3$ or -CH$\sb3$ groups.
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